Thread-protector.



Patented July l7, 1900. M BLAKEY I THREAD PROTECTOR. (Application filedJan. 223, 1900 1 (No Model.)

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NlTED STATES PAT NT OFFICE.

MILDRED BLAKEY, OF ROME, OHIO, ASSIGNOR TO THE NATIONAL TUBE COMPANY, OFNEW YORK, N. Y., AND MCKEESPORT, PENNSYLVANIA.

TH READ-PROTECTOR.

SPECIFICATION formingpart of Letters Patent No. 653,897, dated July 17,1900. l

Application filed January 23; 1900. Serial No. 2,478. (No model.)

To all whom it may concern:

Be it known that I, MILDRED BLAKEY, a resident of Rome, in the county ofAshtabula and State of Ohio, have invented a new and useful Improvementin Thread-Protectors; and I do hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to thread-protectors, its object being to provide asimple form of thread-protector which while screwing onto the tubing orbolts can be produced from a rolled strip'having a very thin body, andyet which is sufii'ciently braced to withstand the ordinary shocks andjars to which tubing is subjected in handling and transportation.

The thread-protector embodying the invention is formed of a thinintegral wroughtmetal band having two or more ribs extending inwardly atintervals therefrom of greater height than the threads to be engaged,the upper edges of such ribs being V-shaped, so as to formscrew-threads, the preferred forms of thread-protectors as producedhaving the entire bodies of the ribs formed V-shaped, and the ribs notonly forming by their upper edges screw-threads to engage with thethreads of the pipe or bar, but bracing the body of the protector andgiving it sufficient rigidity for the purpose, while on account of theheight of such ribs space is provided for the reception of rivets orother fastening devices between the ribs for securing the ends of theannulus or band together.

To enable others skilled in the art to make and use myinvention,l willdescribe the same more fully, referring to the accompanying drawings, inwhich- Figures 1, 3, and 5 are perspective views of different forms ofprotectors embodying my invention; and Figs.'2, 4, and 6 are sectionalviews of the same, illustrating their application to tubing.

The thread-protector embodying the invention is formed of a strip ofwrought iron or steel having ribs rolled on one face thereof, this stripbeing cut to length and bent to form the annulus or band and the endsconnected together in any suitable way. As illustrated in thedrawings-the body portion of the protector can be made of very thinmetal, being for some sizes practically as thin as ordinary sheet metal,as the protector is strengthened and braced by the ribs, so thatnotwithstanding its thin body it is sufficiently stiff for the purpose.

In the drawings, 1 is the body of the protector, on which are formed atsuitable intervals the ribs 2, these ribs projecting inwardly and havingtheir upper ends 3 formed V- shaped, so as to engage with the threads ofthe pipe or bar. It is preferred that these ribs shall be V-shaped incrosssection throughout, as in Figs. 1 to 5, as such form, whilerequiring but little more metal, increases the strength of the ribs andthe bracing of the protector and provides an easier section to roll. Forheavy sizes of the protector the lower portions of the ribs may beformed substantially at right angles to the body portion 1, as at 4 inFig. 6, the V-shaped upper edges 5 resting on such rectangular portions4. It will be noticed that between the several ribs are the spaces 6, itonly being necessary to provide ribs to engage with every third orfourth thread of the tubing or bolt, and it will also be noticed thatthe ribs are of greater height than the depth or height of the threadsof the tubing with which they engage. On account of, this extra heightof the ribs an increase in rigidity of the protector is obtained throughthebracing of such rib portions, while in addition to this between theribs space is provided for v the reception of the rivets or like devicesemployed to secure together the ends of the strip from which the annulusis made. The ribs formed with the bodyare, in efiec't, bracing-ribscarrying on their upper edges V shaped portions to engage with the screwthreads. The number of'such strengthening-ribs employed may vary. InFigs. land 2 I employ one rib near each edge, and I also prefer to benddown the edge portions 7 beyond the ribs slightly, so that in case thetubingprotector on the tubing contacting therewith should movelongitudinally it will naturally slip up the inclined edge 7 of theprotector, any tendency to knock it off the tubing being overcome. InFigs. 3 and 4 two ribs are placed near the edge of the protector, whilein Figs. 5 and 6 one rib is placed near each edge and one in the centerof the protector.

In the manufacture of the thread-protector when it is being bent intoannular form it is given a slight offset or pitch, so that each rib isthrown into spiral form corresponding in pitch to that of the threads ofthe pipe or bar with which the protector is toengage. The ends of theband may be connected together in any suitable way. For example, inFigs. 1, 2, 5, and 6, slots 8 are formed in the ends of the strips andclips 9 fitted into the same and bent down upon the protectorbody. InFigs. 3 and 4 rivets 19 pass through the protector-body and a shortconnectingpiece 11. I am thus enabled to provide a thread-protectorwhich is exceedingly light in weight, having a body made practically ofsheet metal, and having integral therewith strengthening-ribs which giveall necessary rigidity to the protector and in this way provide thethreads for engaging with the pipe or bar, while providing full spacefor connecting up the parts of the strip from which the ring is made.

What I claim as my invention is-- 1. A thread-protector formed of athin, integral, wrought-metal band having two or more ribs extendinginwardly at intervals from its inner face of greater height than thethreads to be engaged, the upper edges of said ribs being V-shaped so asto form screwthreads. V

2. A thread-protector, formed of a thin, integral, wrought-metal bandhaving two or more V-shaped ribs extending inwardly at intervals fromthe inner face of greater height than the threads to be engaged, theupper edges of said ribs forming screw-threads.

3. A thread-protector formed of a thin, in tegral, wrought-metal bandhaving two or more ribs extending inwardly from its inner face, theupper edges of the ribs being V- shaped, and the edge portions of thebody be yond said ribs bent inwardly to form inclines.

In testimony whereof I, the said MILDRED BLAKEY, have hereunto set myhand.

MILDRED BLAKEY.

Witnesses:

M. A. OSBORN, U. R. OsBoRN.

